Abstract
Separating and quantifying effect of overload-induced residual stress (RS) behind and ahead of crack tip on fatigue behavior are inevitable for random fatigue life prediction. In this study, fatigue crack growth measurements under constant stress intensity and different stress ratios for the same overload are performed together with analyzing crack compliance curves. The results show crack closure-depended RS contribution behind crack tip to fatigue retardation results from the variation of crack opening stress intensity which can be directly obtained in fatigue test. Crack closure influence is determined by both effective RS behind crack tip and contact length of crack wake.
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